Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53507f6d6ca7a46…

MALICIOUS

PDF

73.9 KB Created: 2021-04-19 18:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9b8795fd9e7493b283503262ee3e5033 SHA-1: 30d5eebfaf007494516f90df49dad2b4e7a8f542 SHA-256: b53507f6d6ca7a460e04d237d0e5b4aea8fa247069fde03170391ee8d6e3696a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, appears to be a lure related to 'identifying rational numbers worksheet pdf', which is likely a pretext to drive traffic to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=identifying+rational+numbers+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/wavudasawete/FicpoOe/kowomijoxedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_6022d0c362f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_601b1aff04a67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fdc8a14e51dd.pdfIn PDF document text
    • http://zoomita.fun/82267169310lp9u7.pdfIn PDF document text
    • http://covidcapsule.world/biologia_3_eso_santillana_solucionarioinks7.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/ndhf11c/36345633690.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/J2Yjdif/shala_darpan_school_allotment_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/genizataxom/f99sqTh/17319999743.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/gH0Thje/pop_rock_background_music_free_download.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/ap_road_transport_llr.pdfIn PDF document text
    • http://kasyanbeauty.com/what_is_autism_how_to_explain_to_a_child19o7m.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/idxgjr6/25181497861.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Mlpohgq/mojenatadajekizirililex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatujub.rf.gd/37073773295.pdfIn PDF document text
    • https://3f9db7d4-4b29-4b07-aee3-a01cf2993fd2.filesusr.com/ugd/c345b0_685d2bf08244418889149de0155d0d95.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_d66c6577722b41be997cc11c93dc2b0e.pdf?index=trueIn PDF document text
    • http://jakiwokokik.epizy.com/79836717366.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_d060a2ffb840476fade0494f5203ccbf.pdf?index=trueIn PDF document text
    • http://pitodisile.epizy.com/crossfit_workouts_like_cindy.pdfIn PDF document text
    • http://mupevisad.epizy.com/tijum.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 5792 bytes
SHA-256: 1f74e2986717346f713dc085b87ff18909366be98d1fd85127bdb20a1510a1a3
font_01_sfnt_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 11000 bytes
SHA-256: 621003b1a21d6a8f95276c48202253ec57c2734e57c29241cf1651bec0e4192b

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